import turtle



'''
1-18 a

w = 100
turtle.right(90)
turtle.penup()
turtle.goto(-w,w)
turtle.pendown()

turtle.goto(w,w)
turtle.goto(w,-w)
turtle.goto(-w,-w)
turtle.goto(-w,w)

turtle.penup()
turtle.goto(-w,0)
turtle.pendown()
turtle.goto(w,0)

turtle.penup()
turtle.goto(0,w)
turtle.pendown()
turtle.goto(0,-w)

turtle.penup()
turtle.goto(0,0)
turtle.pendown()
'''

w = 50
turtle.forward(w)
turtle.right(90)
turtle.forward(w)
turtle.right(90)
turtle.forward(w)
turtle.right(90)
turtle.forward(w)

turtle.left(90)
turtle.forward(w)
turtle.left(90)
turtle.forward(w)
turtle.left(90)
turtle.forward(w)
turtle.left(90)
turtle.forward(w)

turtle.forward(w)
turtle.left(90)
turtle.forward(w)
turtle.left(90)
turtle.forward(w)
turtle.left(90)
turtle.forward(w)

turtle.forward(w)
turtle.left(90)
turtle.forward(w)
turtle.left(90)
turtle.forward(w)
turtle.left(90)
turtle.forward(w)


turtle.done()